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Home >> Toyota >> 2003 >> MR2 C65M >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P1645: Multiplex Communication Malfunction >> Circuit Description
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Circuit Description

ECM receives the operating condition of A/C system from the instrument cluster. ECM also receives electrical load information from the body ECM over the bus communications system from the instrument cluster. ECM uses this information to control engine idle speed.

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